olympia electronics TS293KI Explosion Proof Hydrogen Analog Detector User Manual

TS293KI Explosion Proof Hydrogen Analog Detector
User Manual 

TS293KI Explosion Proof Hydrogen Analog Detector

Flammable Gas Detector with 4÷20mA output
Please read and keep this manual
II 2G Ex d IIC T6 Gb
Certificate number
CESI 03 ATEX 323 X

Inside Replaceable Cartridge Sensor

Technical specifications

DESCRIPTION

The TS293K series is a gas detector able to detect combustible gases by employing a catalytic sensor calibrated up to 20% LEL to different gases and find their best application in centralized alarm systems for car parks, manufacturing industries, etc. The instrument is flameproof certified and comprises of an enclosure in which the electronic circuit and the terminals are mounted and a downward facing cylindrical sensor housing inside a replaceable “Cartridge Sensor”. The instrument has a 4÷20mA linear output (S) with 20%LIE (Lower Explosive Limit) F.S. of detected gas. This output is connectable to a remote Gas Central Unit as listed in Table 1. The Printed Circuit Board, F1 and F2 key used for the Test and Calibration routine, protected by a code, and 3 LEDs show the working conditions:

or expired.

NOTES ON THE AVAILABLE MODELS
The above Gas value data are taken from Annex B) of EN 60079-20-1. TS293KM (Methane CH4) is calibrated to detect Methane, a gas lighter than air. Its density as to air is 0.55 and its LEL (Lower Explosive Limit) is 4.4%volume. TS293KG (GPL) is calibrated to detect LPG, a gas heavier than air, and consists of a mixture of 20-30% Propane (C3H8) and 80-70% Butane (C4H10). Propane density as to air is 1.56 while Butane is 2.05. The LEL is 1.7% volume for Propane and 1.4% volume for Butane. Standard calibration to LPG is carried out for Butane gas. TS293KI (Hydrogen H2) is calibrated to detect Hydrogen, is a colorless, odorless, highly flammable gas and is the lightest gas. Its density as to air is 0.07 and its LEL (Lower Explosive Limit) is 4% volume. TS293KB (Unleaded Gasoline/Petrol) is calibrated to detect Gasoline vapors heavier than air and highly flammable. Its density as to air is about 2.8 and it’s LEL (Lower Explosive Limit) is about 1.2% volume.

OPERATIONAL DESCRIPTION

The catalytic sensor is practically insensitive to humidity and temperature variations. The calibration is carried out for the specific gas to be detected. Anyway, it can contemporaneously detect any other flammable gas that should be present in the same environment. Note that the LEDs are not visible when the enclosure is closed. Preheating: when powered, the sensor needs a time of preliminary heating of about 60 seconds. During this period the yellow LED “FAULT” flashes. After this period, the yellow LED light is off, the green LED “ON” illuminates to indicate normal functioning. After this period the unit is able to detect gas even if it attains the optimum stability conditions after about 4 hours of continual functioning. Normal operation: the green LED “ON” should be light on.
Alarm: When Gas concentration attains 20% LEL the red LED “ALARM” illuminates (only if it be activated by Dip-Switch).
Faults: the Yellow LED illuminates and the “S” output falls down to 0mA.
(The different faults are listed below). Yellow LED illuminates every 4 seconds (with green LED activated): this happens when the “Cartridge Sensor” has overcome its period of life (about 5 years) and its correct operation is not longer guaranteed. The detector keeps on operating but it is necessary to replace, as soon as possible, the “Cartridge Sensor” with a new one. The type to be required is listed on Page 1 or in Table 3. The replacement procedure is described in the attached manual.
Yellow LED activate, green LED off (0mA output signal): this signal different kind of faults.

1. The Dip Switch setup is wrong, please verify (see Table 2).
2. The “Cartridge Sensor” is not working, please replace it with a new one.
3. If a new “Cartridge Sensor” is installed or it is not correctly connected or a not compatible one is mounted.

Please check the cartridge connections and compatibility (see Table 3) these checks are made connecting and disconnecting the device. If the condition does not change, please replace the unit and/or send it back to the supplier to repair. Yellow and green LED activates (0mA output signal): this happens when the “Cartridge Sensor” is not working. First, try to perform the procedure of “ZERO” as described in the section “Test and Calibration > Zero adjust” then disconnect and connect the unit, and finally, try to replace a new “Cartridge Sensor”. If the condition is not changed, please replace the unit and/or send it back to the supplier to repair.
All LED activates (>24mA output signal): this happens when the “Cartridge Sensor” is not working or gas concentration is out of scale (higher than 25% LIE) If there are not any gas leaks and the condition is not changed, please replace the unit and/or send it back to the supplier to repair.

INSTALLATION

 The detector must be accurately installed and tested according to the national dispositions in force on the safety of the plants and installation of electric devices in areas with danger of explosion.
Mounting: Fig. 2 shows the instrument size. The unit must be positioned vertically with the sensor downwards. Model TS293KG positioning: it should be fixed at 20-30 cm from the floor (the LPG gas is heavier than air). Model TS293KM positioning: it should be fixed at 20-30 cm from the ceiling (the Methane gas is lighter than air). Model  S293KI positioning: it should be fixed at 20-30 cm from the ceiling (the Hydrogen gas is lighter than air). model TS293KB
positioning: it should be fixed at 30-40 cm from the floor (the Petrol gas is heavier than air). Electrical Connection (see Fig.2): the maximum distance to install each detector from the Gas Central Unit is shown in table 1.  normally use a tree wire shielded cable. The terminals (+ – S), are polarized plug-in types, it is necessary to extract them to make the connection.
Note: Dip-Switch should be set with the instrument powered off. Dip- Switch 1 settled ON activates ALARM Red LED indication (see Table 2).
Important: Once installation is completed, power up the unit, wait about 20 to 30 minutes and then to adjust the sensor to the environment, only if it is necessary, carry out the ”Zero Adjust” (see ‘Test and Calibration).
COMPATIBILITY WITH OTHER CENTRAL UNITS: In the case of a central unit other than Tecnocontrol, please verify the max load resistor as shown in Fig. 4. We suggest using a 24Vdc power supply.
WARNING
Average life: The sensitive element used in this detector has excellent stability in time. In fresh air and in normal working conditions the sensor’s life is about 5 years from the date of installation. After this period the yellow LED “FAULT” flashes every 4 seconds, is necessary to replace the “Cartridge Sensor”. Periodical testing: we advise carrying out working tests every 12 months. Operation Check, Zero Adjust,, Calibration Check and Calibration with Gas/Air mixture as explained on page 4 of the chapter “Tests and Calibration”.
Note: the detector is not able to detect gas leaks occurring outside the room where it is installed, neither inside walls or under the floor.
Important: The catalytic sensor operates only in presence of Oxygen. Do not use pure gases or a lighter directly on the sensor since they could damage it irremediably. Warning: Consider that in polluted environments, or with vapors of flammable substances (including solvents), the lifetime of the sensor can be reduced. Some substances cause a permanent reduction of sensitivity; avoid contact of the sensor with vapors of Silicon (found in paints, sealants, and greases), Tetraethyl lead, and Phosphate esters. Other substances cause a temporary loss of sensitivity; these “inhibitors” include Halogens, Hydrogen sulfide, Chlorine, and Chlorinated hydrocarbons (Trichloroethylene or Carbon tetrachloride). After a short time in the fresh air, the sensor resumes its normal operation.

TEST AND CALIBRATION

PAY ATTENTION: This procedure has to be made with extreme attention and by authorized and trained people; because starting this procedure it will increase mA output causing the activation of connected alarm devices. Operation Check, Zero Adjust, Calibration Check and Calibration: are different code-protected functions. To access these functions is necessary to insert the relevant “Code” through the keys F1 and F2. To have the key pressure recognized, hold pressing it for around a second (until the green LED doesn’t switch off for a moment). Then the next key can be pressed. In case of error all it takes is waiting around 10 seconds and the sequence is automatically erased. Calibration Kit, Sample Gas Bottles (for Calibration Check and Calibration) please, only using a mixture
20%LEL (0.88% volume) Methane in Air (20.9% Oxygen)
20%LEL (0.88% volume) Methane in Air (20.9% Oxygen) You can use either the disposable cylinder or Tecnocontrol mod. BO200, complete with an adjusted valve or the high-pressure ones with reduction gear. Is also necessary to use the calibration kit Tecnocontrol mod. TC011. “INSTRUMENT OPERATION CHECK” (Check Code: F2, F2, F1, F1): this function allows for the effect of a functional test of the equipment. After having inserted the “Check Code”, all LEDs are switched off. Then LEDs will switch on in sequence, from the yellow up to the red. In the end, all the LEDs will remain lighted for around 5 seconds, and then the instrument returns at the conditions of normal operation. It is advisable to perform this operation every 12 months according to the use. Note: this function is not working if the red LED is already switched on. “ZERO ADJUST” (Zero Code: F2, F1, F1, F2): this function is to adjust the Zero sensor and can be done in clean air only (an environment without the presence of gas or other pollutants). Consider that the TS293K has a sophisticated follower of zero, that every hour will reset the sensor if of course there is the presence of gas. If necessary, perform this operation after installation or after changing the “Cartridge” or every 6-12 months depending on environmental conditions. After entering the “Zero Code” as confirmation of the operation, there will be a flashing red LED and the output becomes 4.0 mA.
Note: This function is not working if the mA output is more than 12mA (10% LEL) and/or the red LED is already been switched on. In this case, it will be necessary to recalibrate the unit and/or replace the “Cartridge” CALIBRATION” (Calibration Code: F2, F2, F2, F1, F2, F1) : this function allows completely recalibrating the sensor using the gas mixture indicated above.
Warning: to guarantee that no errors of elaboration happen, the rare possibility exists that during the Calibration the yellow LED switch off every 8 seconds, in this case, interrupts the procedure, switch off and switch on the instrument and repeat the Calibration. If the condition persists it will be necessary to send the detector to the supplier for reparation.
Important note: During the Calibration routine, the mA output indicates 0mA. The “Calibration” can be done in clean air only (an environment without the presence of flammable or other polluting gas). With the keys perform the “Calibration Code “. Wait until the yellow and green LEDs switch on a fix and the red LED starts to flash. Insert the TC011 on the sensor holder, adjust the sample gas bottle valve as the flow meter indicates around 0.3 l/mins (see Fig.3). Wait around 3 minutes, until the red LED lights (and while it is ON), press the key F2 and hold it pressed until the red LED is switched off for at least 2 seconds (but if the red LED continues to blink more than 4-5 minutes means that the gas flow is not constant or unsatisfactory, or the concentration is not as required, stop the operation, turn off the instrument and recalibrate). Then, close the gas cylinder and remove TC011. At this point we can have two possibilities:
Yellow and green LED illuminates: the calibration routine is correct. Wait 8 seconds, until the instrument automatically restores the normal working conditions. (See “Operational Description > Preheating”)
Yellow LED illuminates: the routine has failed. In this case, wait 8 seconds, until the instrument automatically repeats Preheating, then repeat the “Calibration” routine without inserting again the code. If the condition still persists after the replacement of the “Cartridge”, it will be necessary to send the detector back to the manufacturer for reparation. “CALIBRATION CHECK” (Cal Check Code: F2, F1, F2, F1): using the gas mixture indicated above, this function is used to control, the correct response to the gas and can be made after the “Calibration” or the installation. But should be done during periodic maintenance, as it is the only method to verify the effective functioning of the detector.
With the keys perform the “Cal Check Code “. Wait until the yellow LED starts to flash (the green one remains to fix) Insert the TC011 over the sensor holder, adjust the sample gas bottle valve as the flow meter indicates around 0.3 l/mins (see Fig.3). Verify with a voltmeter connected to the Test-Point “TESTmA”, the value reaches the mV value between 184 and 216mV, [corresponding to 20mA (±1.6) output and the central unit should be display about 20% LEL (±2)]. If the result is different, is necessary to recalibrate the sensor (see “Calibration”). If the result is different, is necessary to recalibrate the sensor (see “Calibration”). Then, close the gas bottle, and remove TC011. Then, the mA output will slowly decrease up to 4mA.

Cable Size| Cable Resistance| the maximum distance to install each| The max distance to install each detector from the Gas
---|---|---|---
0,75 mm2| 26 Ω/km| 100 m| 300 m
1 mm 2| 20 Ω/km| 150 m| 400 m
1,5 mm2| 14 Ω/km| 200 m| 500 m
2,5 mm2| 8 Ω/km| 400 m| 800 m
“S1-SET”(Dip-Switch)

1| 2| 3| 4| LED Allarme
ON| ON| ON| ON| OFF
ON| OF| OFF| OF| ON

IP-Switch the should be set with the instrument powered off

1| 2 (1)| 3| 4 (2)| 5 (1)| 6 (3)| 7| 8| 9| 10
---|---|---|---|---|---|---|---|---|---
**Model and detected Gas| n.CASCAIS. ° CAS| Formulabruta| ****“K”| LEVEL vol| Density ria /Air 1| 20% LIE/LEL %vol| (TP1/TP2) mV| Uscita Output Sorti| LEL %
TS293KM Metano| 74-82-8| CH 4| 1,00| 4,40| 0,554↑| 0,88| 72 ,0| 7,20| 20
TS293KG Butano| 106-97-8| C 4 H 10| 1,92| 1,50| 2,05↓| 0,30| 99,2| 9,92| 37
 Propane| 74-98-6| C 3 H 8| 1,95| 2,10| 1,56↓| 0,42| 104,0| 10,40| 40
TS293KI| 1333-74-0| H 2| 1,24| 4,00| 0,07↑| 0,80| 81,6| 8,16| 26
TS293KB| (5)| (5)| 2,20 (4)| 1,20| ≥ 2,5 ↓| 0,24| 110,4| 11,04| 44**

NOTE:

1. Data are taken from Annex B) of EN 60079-20-1
2. K = Gain with respect to Methane
3. Values obtained from tests
4. Data not present in the standards EN

References

• CPF Tecnocontrol GECA – Official Site

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